code: def test_simple_train(self):
      trainer_params = uw3_trainer_params()
      with tempfile.TemporaryDirectory() as d:
          trainer_params.output_dir = d
          train.main(trainer_params)
          keras.backend.clear_session()
          resume_training.main(
              [os.path.join(d, "checkpoint", "checkpoint_0001")]
          )
  
file_path: calamari/calamari_ocr/test/test_resume_training.py
imports: import os
  import tempfile
  import unittest
  from tensorflow import keras
  import calamari_ocr.scripts.resume_training
  import calamari_ocr.scripts.train
  from calamari_ocr.test.test_train_file import uw3_trainer_params
label_desc: Use image node_id 2 for calling the TestTrainFile obj's underlying member method code with example usage: obj.test_simple_train() without return types